We began the lesson with students reflecting back on the vocabulary words they learned on Monday (enzyme, reactant, and product). Students used the vocabulary to describe the chemical equation written on the board. The equation showed the enzyme catalase converting the reactant hydrogen peroxide (H2O2) into the products water (H2O) and oxygen (O2). Students then learned that catalase is an enzyme found in animals and potatoes. The enzyme has one of the fastest known reaction rates, converting 5 million H2O2 molecules into H2O and O2 every second! Students learned that we would be conducting an experiment with potatos to measure the rate of oxygen gas produced from the reaction of potato catalase with hydrogen peroxide. After writing down the procedure and watching a demonstration of the steps, students were assigned to groups and worked through the experiment, collecting initial and final temperature readings, as well as the change in oxygen percentage released over 10 minutes. Once the experiment was underway, students who were not actively timing or recording the results were assigned the job of typing up the procedure using the Chromebooks. We will analyze the results tomorrow.
We began Chapter 4 with the Flame Test lab. We reviewed the safety requirements and lab mechanics. There were stations set up around the room with portable Bunsen burners, chemicals to burn, and equipment to conduct the flame test. Students recorded their results as described on the Lesson 17 Worksheet. Students were also offered 10 points of extra credit for taking video of the flame tests and editing them together into a video. Students also received a print-out of the electron structure of a sodium atom, showing what happens when the outer shell electron of sodium is excited. The lab took most of the class period, so we will discuss results tomorrow. Students should complete as much of the Lesson 17 worksheet as possible, read Lesson 17 in the textbook, and answer questions 1 and 2 in the textbook.